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package extra
import (
"github.com/json-iterator/go"
"strings"
"unicode"
)
// SetNamingStrategy rename struct fields uniformly
func SetNamingStrategy(translate func(string) string) {
jsoniter.RegisterExtension(&namingStrategyExtension{jsoniter.DummyExtension{}, translate})
}
type namingStrategyExtension struct {
jsoniter.DummyExtension
translate func(string) string
}
func (extension *namingStrategyExtension) UpdateStructDescriptor(structDescriptor *jsoniter.StructDescriptor) {
for _, binding := range structDescriptor.Fields {
if unicode.IsLower(rune(binding.Field.Name()[0])) || binding.Field.Name()[0] == '_'{
continue
}
tag, hastag := binding.Field.Tag().Lookup("json")
if hastag {
tagParts := strings.Split(tag, ",")
if tagParts[0] == "-" {
continue // hidden field
}
if tagParts[0] != "" {
continue // field explicitly named
}
}
binding.ToNames = []string{extension.translate(binding.Field.Name())}
binding.FromNames = []string{extension.translate(binding.Field.Name())}
}
}
// LowerCaseWithUnderscores one strategy to SetNamingStrategy for. It will change HelloWorld to hello_world.
func LowerCaseWithUnderscores(name string) string {
newName := []rune{}
for i, c := range name {
if i == 0 {
newName = append(newName, unicode.ToLower(c))
} else {
if unicode.IsUpper(c) {
newName = append(newName, '_')
newName = append(newName, unicode.ToLower(c))
} else {
newName = append(newName, c)
}
}
}
return string(newName)
}
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